package me.ivps.android.weibo.support.lib;

import me.ivps.android.weibo.support.utils.GlobalContext;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Looper;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageView;

/**
 * 失焦图片控件
 * 
 * User: qii Date: 14-1-22
 */
public class BlurImageView extends ImageView {
    
    private static int radius = 20;
    
    private Thread blurThread;
    
    private String url;
    
    public BlurImageView(Context context) {
        super(context);
    }
    
    public BlurImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    
    public BlurImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
    
    public void setOriImageUrl(String url) {
        this.url = url;
    }
    
    @Override
    public void setImageDrawable(final Drawable drawable) {
        
        if (TextUtils.isEmpty(url)) {
            return;
        }
        
        if (drawable instanceof BitmapDrawable) {
            BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
            final Bitmap bitmap = bitmapDrawable.getBitmap();
            if (bitmap != null) {
                
                Bitmap blurBitmap = GlobalContext.getInstance()
                        .getBitmapCache().get(url + "/blur");
                if (blurBitmap == null) {
                    blurThread = new Thread(new Runnable() {
                        @Override
                        public void run() {
                            final Bitmap createdBlurBitmap = fastBlur(bitmap,
                                    radius);
                            final Drawable blurDrawable = new BitmapDrawable(
                                    getResources(), createdBlurBitmap);
                            if (Thread.currentThread().isInterrupted()) {
                                return;
                            }
                            new Handler(Looper.getMainLooper())
                                    .post(new Runnable() {
                                        @Override
                                        public void run() {
                                            GlobalContext
                                                    .getInstance()
                                                    .getBitmapCache()
                                                    .put(url + "/blur",
                                                            createdBlurBitmap);
                                            BlurImageView.super
                                                    .setImageDrawable(blurDrawable);
                                        }
                                    });
                        }
                    });
                    blurThread.start();
                }
                else {
                    final Drawable blurDrawable = new BitmapDrawable(
                            getResources(), blurBitmap);
                    BlurImageView.super.setImageDrawable(blurDrawable);
                }
                return;
            }
            
        }
        super.setImageDrawable(drawable);
    }
    
    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (blurThread != null) {
            blurThread.interrupt();
        }
    }
    
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }
    
    private Bitmap fastBlur(Bitmap sentBitmap, int radius) {
        // on Android 4.4, some bitmaps will crash, fuck RenderScript
        // if (Utility.isJB1()) {
        // Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
        //
        // final RenderScript rs = RenderScript.create(getContext());
        // final Allocation input = Allocation
        // .createFromBitmap(rs, sentBitmap,
        // Allocation.MipmapControl.MIPMAP_NONE,
        // Allocation.USAGE_SCRIPT);
        // final Allocation output = Allocation.createTyped(rs,
        // input.getType());
        // final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs,
        // Element
        // .U8_4(rs));
        // script.setRadius(radius /* e.g. 3.f */);
        // script.setInput(input);
        // script.forEach(output);
        // output.copyTo(bitmap);
        // return bitmap;
        // }
        
        // Stack Blur v1.0 from
        // http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
        //
        // Java Author: Mario Klingemann <mario at quasimondo.com>
        // http://incubator.quasimondo.com
        // created Feburary 29, 2004
        // Android port : Yahel Bouaziz <yahel at kayenko.com>
        // http://www.kayenko.com
        // ported april 5th, 2012
        
        // This is a compromise between Gaussian Blur and Box blur
        // It creates much better looking blurs than Box Blur, but is
        // 7x faster than my Gaussian Blur implementation.
        //
        // I called it Stack Blur because this describes best how this
        // filter works internally: it creates a kind of moving stack
        // of colors whilst scanning through the image. Thereby it
        // just has to add one new block of color to the right side
        // of the stack and remove the leftmost color. The remaining
        // colors on the topmost layer of the stack are either added on
        // or reduced by one, depending on if they are on the right or
        // on the left side of the stack.
        //
        // If you are using this algorithm in your code please add
        // the following line:
        //
        // Stack Blur Algorithm by Mario Klingemann <mario@quasimondo.com>
        
        Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
        
        if (radius < 1) {
            return (null);
        }
        
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        
        int[] pix = new int[w * h];
        Log.e("pix", w + " " + h + " " + pix.length);
        bitmap.getPixels(pix, 0, w, 0, 0, w, h);
        
        int wm = w - 1;
        int hm = h - 1;
        int wh = w * h;
        int div = radius + radius + 1;
        
        int r[] = new int[wh];
        int g[] = new int[wh];
        int b[] = new int[wh];
        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
        int vmin[] = new int[Math.max(w, h)];
        
        int divsum = (div + 1) >> 1;
        divsum *= divsum;
        int dv[] = new int[256 * divsum];
        for (i = 0; i < 256 * divsum; i++) {
            dv[i] = (i / divsum);
        }
        
        yw = yi = 0;
        
        int[][] stack = new int[div][3];
        int stackpointer;
        int stackstart;
        int[] sir;
        int rbs;
        int r1 = radius + 1;
        int routsum, goutsum, boutsum;
        int rinsum, ginsum, binsum;
        
        for (y = 0; y < h; y++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            for (i = -radius; i <= radius; i++) {
                p = pix[yi + Math.min(wm, Math.max(i, 0))];
                sir = stack[i + radius];
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rbs = r1 - Math.abs(i);
                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                }
                else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
            }
            stackpointer = radius;
            
            for (x = 0; x < w; x++) {
                
                r[yi] = dv[rsum];
                g[yi] = dv[gsum];
                b[yi] = dv[bsum];
                
                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;
                
                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];
                
                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];
                
                if (y == 0) {
                    vmin[x] = Math.min(x + radius + 1, wm);
                }
                p = pix[yw + vmin[x]];
                
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                
                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];
                
                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;
                
                stackpointer = (stackpointer + 1) % div;
                sir = stack[(stackpointer) % div];
                
                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];
                
                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];
                
                yi++;
            }
            yw += w;
        }
        for (x = 0; x < w; x++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            yp = -radius * w;
            for (i = -radius; i <= radius; i++) {
                yi = Math.max(0, yp) + x;
                
                sir = stack[i + radius];
                
                sir[0] = r[yi];
                sir[1] = g[yi];
                sir[2] = b[yi];
                
                rbs = r1 - Math.abs(i);
                
                rsum += r[yi] * rbs;
                gsum += g[yi] * rbs;
                bsum += b[yi] * rbs;
                
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                }
                else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
                
                if (i < hm) {
                    yp += w;
                }
            }
            yi = x;
            stackpointer = radius;
            for (y = 0; y < h; y++) {
                // Preserve alpha channel: ( 0xff000000 & pix[yi] )
                pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16)
                        | (dv[gsum] << 8) | dv[bsum];
                
                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;
                
                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];
                
                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];
                
                if (x == 0) {
                    vmin[y] = Math.min(y + r1, hm) * w;
                }
                p = x + vmin[y];
                
                sir[0] = r[p];
                sir[1] = g[p];
                sir[2] = b[p];
                
                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];
                
                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;
                
                stackpointer = (stackpointer + 1) % div;
                sir = stack[stackpointer];
                
                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];
                
                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];
                
                yi += w;
            }
        }
        
        Log.e("pix", w + " " + h + " " + pix.length);
        bitmap.setPixels(pix, 0, w, 0, 0, w, h);
        
        return (bitmap);
    }
}
